Diffusion of liquids into semicrystalline polyethylene.

abstract：:In this study, magnetic resonance imaging (MRI) was used to dynamically visualize the diffusion process of CO2 in porous media saturated with liquid hydrocarbon. Based on the assumption of semi-infinite media, effective CO2 diffusivity was obtained directly by the nonlinear fitting of one MR profile during the diffusi...

journal_title：Magnetic resonance imaging

authors： Zhao Y,Chen J,Yang M,Liu Y,Song Y

更新日期：2016-05-01 00:00:00

abstract：:The goal of this study was to determine whether presurgical metabolite levels measured by 3D MR Spectroscopic Imaging (MRSI) can accurately detect viable cancer within human brain tumor masses. A total of 31 patients (33 exams, 39 pathology correlations) with brain tumors were studied prior to surgical biopsy and/or r...

journal_title：Magnetic resonance imaging

authors： Vigneron D,Bollen A,McDermott M,Wald L,Day M,Moyher-Noworolski S,Henry R,Chang S,Berger M,Dillon W,Nelson S

更新日期：2001-01-01 00:00:00

abstract：:Most modern techniques for functional magnetic resonance imaging (fMRI) rely on blood-oxygen-level-dependent (BOLD) contrast as the basic principle for detecting neuronal activation. However, the measured BOLD effect depends on a transfer function related to neurophysiological changes accompanying electrical neural ac...

journal_title：Magnetic resonance imaging

authors： Casciaro S,Bianco R,Distante A

更新日期：2008-11-01 00:00:00

abstract：:A fast spin echo two-point Dixon (fast 2PD) technique was developed for efficient T2-weighted imaging with uniform water and fat separation. The technique acquires two interleaved fast spin echo images with water and fat in-phase and 180 degrees out-of-phase, respectively, and generates automatically separate water an...

journal_title：Magnetic resonance imaging

authors： Ma J,Son JB,Bankson JA,Stafford RJ,Choi H,Ragan D

更新日期：2005-12-01 00:00:00

abstract：PURPOSE:To assess the value of semi-automated segmentation applied to diffusion MRI for predicting the therapeutic response of liver metastasis. METHODS:Conventional diffusion weighted magnetic resonance imaging (MRI) was performed using b-values of 0, 150, 300 and 450s/mm(2) at baseline and days 4, 11 and 39 followin...

journal_title：Magnetic resonance imaging

authors： Stephen RM,Jha AK,Roe DJ,Trouard TP,Galons JP,Kupinski MA,Frey G,Cui H,Squire S,Pagel MD,Rodriguez JJ,Gillies RJ,Stopeck AT

更新日期：2015-12-01 00:00:00

abstract：:Diffusion-weighted imaging (DWI) is a relatively new magnetic resonance imaging (MRI) technique that can be used to probe the microenvironment of water. Contrast in DWI depends on properties different from traditional T1 and T2 contrast, and is derived form the translational motion of water molecules. Since it is reas...

journal_title：Magnetic resonance imaging

authors： Helpern JA,Huang N

更新日期：1995-01-01 00:00:00

abstract：:The value of NMR spectrometry as a way to understand the porosity and permeability of rocks is well documented. Other more esoteric parameters, such as restrictive diffusion, grain size distribution, and fluid viscosities have received less notice but are also available from the NMR measurements as laboratory studies ...

journal_title：Magnetic resonance imaging

authors： Taicher Z,Coates G,Gitartz Y,Berman L

更新日期：1994-01-01 00:00:00

abstract：:Functional magnetic resonance imaging (fMRI) was performed on a conventional 1.5 T scanner by means of a modified FLASH-technique at temporal resolutions of 80 and 320 ms. The method's stability was assessed by phantom measurements and by investigation of three volunteers resulting in a low amplitude (3%) periodic (4 ...

journal_title：Magnetic resonance imaging

authors： Wiener E,Schad LR,Baudendistel KT,Essig M,Müller E,Lorenz WJ

更新日期：1996-01-01 00:00:00

abstract：:Changes in both blood flow and blood oxygenation determine the functional MRI (fMRI) signal. In the present study factors responsible for blood oxygenation (e.g., FiO(2)) were held constant so that changes in pixel count would above all reflect changes in regional cerebral blood flow (rCBF). Continuous positive airway...

journal_title：Magnetic resonance imaging

authors： Lorenz IH,Kolbitsch C,Hörmann C,Schocke M,Kremser C,Zschiegner F,Felber S,Benzer A

更新日期：2001-01-01 00:00:00

abstract：PURPOSE:Lower fat fraction (FF) in brown adipose tissue (BAT) than white adipose tissue (WAT) has been exploited using Dixon-based Magnetic Resonance Imaging (MRI) to differentiate these tissues in rodents, human infants and adults. We aimed to determine whether an optimal FF threshold could be determined to differenti...

journal_title：Magnetic resonance imaging

authors： Jones TA,Wayte SC,Reddy NL,Adesanya O,Dimitriadis GK,Barber TM,Hutchinson CE

更新日期：2018-09-01 00:00:00

abstract：OBJECTIVE:Equivalent cross-relaxation rate imaging (ECRI) is an MRI technique used to evaluate qualitative changes in protein-water interactions. We aimed to prospectively evaluate the utility of ECRI for classification of adipocytic tumors. MATERIALS AND METHODS:Institutional Review Board approval was obtained and al...

journal_title：Magnetic resonance imaging

authors： Okuda H,Matsushima S,Sugiura H,Yamada K,Hamada S,Nishida Y,Ishiguro N

更新日期：2014-04-01 00:00:00

abstract：:The effects of varying the inversion or excitation RF pulse flip angles on image contrast and imaging time have been investigated in IR imaging theoretically, with phantoms and with normal volunteers. Signal intensity in an IR pulse sequence as a function of excitation, inversion and refocusing pulse flip angles was c...

journal_title：Magnetic resonance imaging

authors： Vinitski S,Albert S,Mitchell DG,Tasciyan TA,Rifkin MD

更新日期：1992-01-01 00:00:00

abstract：:We propose a novel processing method for reducing shading artifacts in quantitative susceptibility mapping (QSM) for prostate imaging. In the conventional method, calculation errors in the boundary regions between water and fat cause shading artifacts that degrade the image quality for QSM. In the proposed method, wat...

journal_title：Magnetic resonance imaging

authors： Sato R,Shirai T,Soutome Y,Bito Y,Ochi H

更新日期：2020-02-01 00:00:00

abstract：:Using both quantitative computer-assisted analysis and visual estimation the MR imaging response of brain metastases to whole-brain radiotherapy (WBRT) was prospectively studied in 49 patients. Compared to the computer-assisted analysis, the precision of the visual estimation (by two readers in conference) of tumor re...

journal_title：Magnetic resonance imaging

authors： Taphoorn MJ,Potman RA,Barkhof F,Weerts JG,Valk J,Karim AB,Heimans JJ

更新日期：1997-01-01 00:00:00

abstract：:Autofocusing is a postprocessing technique for motion correction, which optimizes an image quality metric against various trial motions. In this work, image metric maps, which are measures of image quality plotted as a function of in-plane 2-D trial translations, are systematically studied to develop improved autofocu...

journal_title：Magnetic resonance imaging

authors： Lin W,Song HK

更新日期：2006-07-01 00:00:00

abstract：:Gravity drainage characteristics are important to improve our understanding of gas-liquid or liquid-liquid two-phase flow in porous media. Stable or unstable displacement fronts that controlled by the capillary force, viscous force, gravitational force, etc., are relevant features of immiscible two-phase flow. In this...

journal_title：Magnetic resonance imaging

authors： Teng Y,Liu Y,Jiang L,Song Y,Zhao J,Zhang Y,Wang D

更新日期：2016-09-01 00:00:00

abstract：:The results of a magnetic resonance spin-spin relaxation analysis and broad-line magnetic resonance imaging (MRI) (gradient-echo and stray-field imaging) study of water and water transport in Portland cement pastes are presented. The effect of varying the cure conditions and the water to cement (w/c) ratio of the samp...

journal_title：Magnetic resonance imaging

authors： Bohris AJ,Goerke U,McDonald PJ,Mulheron M,Newling B,Le Page B

更新日期：1998-06-01 00:00:00

abstract：PURPOSE:To investigate the alterations in water-fat (W-F) ratio of the normal breast tissue of female volunteers as a function of the histological phases of the menstrual cycle. METHODS:Image-guided volume localized in vivo proton ((1)H) magnetic resonance spectroscopy (MRS) at 1.5 T was carried out in the para-areola...

journal_title：Magnetic resonance imaging

authors： Sharma U,Kumar M,Sah RG,Jagannathan NR

更新日期：2009-07-01 00:00:00

abstract：:Fast magnetic resonance (MR) imaging provides a consistent and predictable appearance of vascular abnormalities as shown by four patients with thrombi, dissection and aneurysm. Fast MR images are obtained during breath-holding, resulting in an absence of respiratory motion artifacts. The time of MR study is much less ...

journal_title：Magnetic resonance imaging

authors： Raval B,Kulkarni M,Narayana P,Mehta S

更新日期：1988-07-01 00:00:00

abstract：:Metabolic imaging of hyperpolarized [1-(13)C] pyruvate co-polarized with [(13)C]urea by dynamic nuclear polarization with rapid dissolution is a promising new method for assessing tumor metabolism and perfusion simultaneously in vivo. Novel pulse sequences are required to enable dynamic imaging of multiple (13)C spect...

journal_title：Magnetic resonance imaging

authors： von Morze C,Sukumar S,Reed GD,Larson PE,Bok RA,Kurhanewicz J,Vigneron DB

更新日期：2013-02-01 00:00:00

abstract：:We present the case of a 44-year-old man who complained of cervical pain. He was treated with physiotherapy and analgetics. Because of persistent pain, computed tomography (CT) scan and MRI were performed. They revealed an osteolytic destruction of the fourth cervical vertebra. The patient was treated surgically for r...

journal_title：Magnetic resonance imaging

authors： Simanski C,Bouillon B,Brockmann M,Tiling T

更新日期：2004-05-01 00:00:00

abstract：:Gadolinium-based magnetic resonance (MR) contrast agents (GBCM) causes a devastating systemic fibrosing illness, nephrogenic systemic fibrosis (NSF), in patients with reduced kidney function. GBCM targets iron-recycling CD163- and ferroportin-expressing macrophages to release labile iron that mediates gadolinium toxic...

journal_title：Magnetic resonance imaging

authors： Swaminathan S

更新日期：2016-12-01 00:00:00

abstract：:We used magnetic resonance imaging (MRI) and water-suppressed proton MR spectroscopic imaging (1H MRSI) to study the effects of human immunodeficiency virus (HIV) infection on the brain. Our recent in vivo finding of lower N-acetylaspartate (NAA), a putative marker of neurons, in the supraventricular brain of cognitiv...

journal_title：Magnetic resonance imaging

authors： Meyerhoff DJ,MacKay S,Poole N,Dillon WP,Weiner MW,Fein G

更新日期：1994-01-01 00:00:00

abstract：:Respiratory motion and capnometry monitoring were performed during blood oxygen level-dependent (BOLD) functional magnetic resonance imaging (fMRI) of the brain while a series of paced hyperventilation tasks were performed that caused significant hypocapnia. Respiration volume per time (RVT) and end-tidal carbon dioxi...

journal_title：Magnetic resonance imaging

authors： Vogt KM,Ibinson JW,Schmalbrock P,Small RH

更新日期：2011-11-01 00:00:00

abstract：:Ultra-high field magnetic resonance imaging data obtained using a multi-echo gradient echo sequence has been shown to contain information on tissue microstructure. Quantitative assessment of water fraction, relaxation time and frequency shift using multi-compartment signal modelling may help improve our understanding ...

journal_title：Magnetic resonance imaging

authors： Thapaliya K,Urriola J,Barth M,Reutens DC,Bollmann S,Vegh V

更新日期：2019-09-01 00:00:00

abstract：PURPOSE:To evaluate the correlation between the pancreatic exocrine insufficiency estimated by cine-dynamic MRCP using spatially selective IR pulse and the severity stages (modified Cambridge classification) based on morphological changes of the pancreatic duct in patients with suspected chronic pancreatitis. MATERIAL...

journal_title：Magnetic resonance imaging

authors： Yasokawa K,Ito K,Kanki A,Yamamoto A,Torigoe T,Sato T,Tamada T

更新日期：2018-05-01 00:00:00

abstract：PURPOSE:To implement and evaluate interleaved blip-up, blip-down, non-segmented 3D echo planar imaging (EPI) with pseudo-continuous arterial spin labeling (pCASL) and post-processing for reduced susceptibility artifact cerebral blood flow (CBF) maps. MATERIALS AND METHODS:3D EPI non-segmented acquisition with a pCASL ...

journal_title：Magnetic resonance imaging

authors： Gai ND,Chou YY,Pham D,Butman JA

更新日期：2017-12-01 00:00:00

abstract：:Two parallel imaging methods used for first-pass myocardial perfusion imaging were compared in terms of signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR) and image artifacts. One used adaptive Time-adaptive SENSitivity Encoding (TSENSE) and the other used GeneRalized Autocalibrating Partially Parallel Acquisi...

journal_title：Magnetic resonance imaging

authors： Irwan R,Lubbers DD,van der Vleuten PA,Kappert P,Götte MJ,Sijens PE

更新日期：2007-06-01 00:00:00

abstract：:In this work an interleaved multiple-gradient-echo chemical shift imaging (IMGE-CSI) technique was designed, implemented and evaluated at 1.5 and 4T for high-resolution lipid quantification and R(2)* measurement in-vivo. The method is analogous to echo planar CSI but utilizes conventional gradient echoes, exploiting t...

journal_title：Magnetic resonance imaging

authors： Hilaire L,Wehrli FW,Song HK

更新日期：2000-09-01 00:00:00

abstract：PURPOSE:To establish an optimized sequence design for fast acceleration of arterial spin labeling (ASL)-based time-resolved magnetic resonance angiography (MRA) by acquisition of control and labeled images in the same shot (fast ACTRESS) and a scan time of <1min, for the evaluation of intracranial vessels. MATERIALS A...

journal_title：Magnetic resonance imaging

authors： Sugimori H,Fujima N,Suzuki Y,Hamaguchi H,Ishizaka K,Kudo K

更新日期：2017-11-01 00:00:00